TRANSFORMER INRUSH CURRENT
TRANSFORMER INRUSH CURRENT
(OP)
Dear Friends
could you pelase tell me that what is normal multiplying factor for transformer inrsuh current. for exammple if the HV Amps are 100 so by which factor we will multiply it.
could you pelase tell me that what is normal multiplying factor for transformer inrsuh current. for exammple if the HV Amps are 100 so by which factor we will multiply it.






RE: TRANSFORMER INRUSH CURRENT
RE: TRANSFORMER INRUSH CURRENT
It depends...
"Will work for (the memory of) salami"
RE: TRANSFORMER INRUSH CURRENT
2 times @ 100 sec
3 times @ 10 sec
6 times @ 1 sec
12 times @ 0.1 sec
25 times @ 0.01 sec
These are typical for distribution transformers and will be conservative for larger power transformers.
RE: TRANSFORMER INRUSH CURRENT
0 – 1000 kVA : 9.5 – 12 x In
1000 – 10000 kVA : 5.9 – 11.4 x In
10000-100000 kVA : 3.6 – 7.5 x In
> 100000 kVA : 2.5 – 4.8 x In
but there is no specific value for tow winding TR, it can reach for 40 x, you can refer to IEC 60076. The condition can be worse if the sympathetic inrush occurs
RE: TRANSFORMER INRUSH CURRENT
IEEE Std 242-2001 Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems
CH.11.9.2.2.1 Transformer through-fault capability